Binding-post and connection for electrical apparatus.



No. 638,230. Patented Dec. 5, I899.

A. FISCHER. BINDING POST AND CONNECTION F08 ELECTRICAL APPARATUS.

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ALEXANDER FISCHER, OF NEW YORK, N. Y., ASSIGNOR TO ALBERT R. SHAT- TUGK,OF SAME PLACE.

BINDING-POST AND CONNECTION FOR ELECTRICAL APPARATUS.

SPECIFICATION forming part of Letters Patent No. 638,230, dated December5, 1899- Application filed May 1,1899. Serial No. 715,078. (lilo model.)

To all whom it may concern:

Be it known that I, ALEXANDER FISCHER, of the city, county, and State ofNew York, have invented a new and useful Improvement in Binding-Postsand Connections for Electrical Apparatus, of which the following is aspecification.

My invention has for its object to provide a means for electricallyconnecting a conduct- 1o ing wire or cable to any electrical appliancesuch, for example, as an induction-coilin such a manner as that theconnection will be completely impervious to moisture, either at thejoint or elsewhere. I

My invention consists, first, in the construction of the connectingdevice which is secured to the conducting-wire, and, second, in thecombination of that device with a casing of insulating and imperviousmaterial inclos- 2o ing said appliance in such a way as to form amoisture-tight joint.

My invention consists more particularly in the construction andarrangement of the several parts, as hereinafter pointed out in theclaims.

In the accompanying drawings, Figure 1 is an enlarged cross-sectionalview of niyimproved binding-post and connection. Fig. 2 shows inperspective two of said binding-posts in place upon the inclosing caseof an electrical appliance.

Similar letters of reference indicate like parts.

A is a rod of metal screw-threaded on its 5 exterior and secured in anysuitable way in the side of the inclosing case B,-whicl1 is ofnon-conducting material. The post A connects with the electricalappliance Within the case by means of the wire 0. (Shown broken off inFig. 1.)

D is a tubular cylinder of metal closed at one end and threaded bothinside and outside. The external thread of cylinder D engages with theinternal thread of an inclos- 5 ing cylinder E, which is made of hardrubber or other Waterproof insulating material. Cylinder E is closed atone end and is provided at such closed end with a small opening throughwhich passes the conducting-wire F. This wire enters a recess in theclosed end of cylinder D and is secured therein by solder or othersuitable means. Surrounding wire F maybe a coating of cotton G, andoutside of said coating is a covering H of soft rubber, which is securedby cement at J within the opening in cylinder E, through which itpasses. The post A is received in the threaded bore of cylinder D, whichis screwed down upon said post. Between the lower edge of cylinder D andthe side of the case B is inter- 6o posed a soft-rubber washer I. Bythis construction I obtain a perfectly water-tight connection. The wire0, being covered by rubber, is of course impervious to moisture. Thejoint at'J between the rubber covering and the rubber cylinder E is alsotight. The rubber cylinder E completely protects the inner metalcylinder D, and it will be noticed that the said cylinder D does notcompletely fill the inclosing rubber cylinder E. Hence the joint betweenthe rubber cylinderE and side of the case B involves simply theapproximation of hard-rubber faces to the soft-rubber washer I, wherebysaid joint is packed, by the screwing down of cylinder D upon post A, astightly as may be desired.

The side B may be a part of a box or case of any desired form-such, forexample, as shown in Fig. 2-and any electrical appliance may be inclosedtherein. My invention is, however, especially applicable toinductioncoils, and especially those used for the production ofigniting-sparks for gas-engines, &c. In such event it isexceedinglyimportaut that the coil and all its connections. should beprotected from moisture, as otherwise the efficiency of the coil rapidlydeteriorates. Such a coil would therefore be inclosed in the caserepresented in Fig. 2 with its terminals united to binding posts, asshown, constructed in the manner already eX- plained.

In the specific construction shown in the drawings I have representedthe cylinder D as externally threaded and engaging with the 5internally-threaded cylinder E of non-conducting material; but it is tobe distinctly understood that I do not limit myself to this mode ofsecuring the external cylinder upon the internal cylinder, since it isobvious that too I may make said cylinders smooth internally andexternallyin lieu of screw-threaded and secure them together by means ofcement or by any other suitable means.

I claim 1. The combination of the tubular cylin- 5 der D of conductingmaterial having one end closed, the inclosing tubular cylinder E ofnon-conducting Waterproof material and closed at one end and receivingand secured to said cylinder D, the conducting-wire F ex {0 tendingthrough said cylinder E and electric- 20 binding-post, the tubularcylinder E of nonconducting Waterproof material and closed at one endand receiving and secured to said cylinder D, the conducting-Wire Fextending through said cylinder E and electrically connected to saidcylinder D and the insulating waterproof coating H of said wire formingan impervious joint with said cylinder E, substantially as described.

3. The combination with the casing B of non-conducting material havingthe externally-threaded binding-post A, of the tubular internallythreaded cylinder D of conducting material having one end closed andadapted to receive Within it said bindingpost, the tubular cylinder E ofnon-conducting waterproof material and closed at one end and receivingand secured to said cylinder D, the conducting-wire F extending throughsaid cylinder E and electrically connected to said cylinder D, theinsulating waterproof coating H of said wire forming an impervious jointwith said cylinder E, and the elastic washer I interposed between saidcylinder E and said casing, substantially as described.

ALEXANDER FISCHER. lVitnesses:

CHARLES P. ROWLAND, J. P. GIBsoN.

